linux-kernel - Re: [PATCH] pci-quirks: Unhide 'Overflow' device on i828{6,7}5P/PE chipsets

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:  <495175B2.60307@shaw.ca>
Date:	Tue, 23 Dec 2008 17:35:14 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject:  Re: [PATCH] pci-quirks: Unhide 'Overflow' device on i828{6,7}5P/PE
 chipsets

Michał Mirosław wrote:
> As I found out from EDAC driver sources for i82875P some BIOSes for
> i82875P/PE hide 'overflow' device 6. The same thing happens for
> i82865P/PE chipsets.
> 
> After testing this patch for couple of days on my laptop (i82856P)
> it looks like something is resetting device 0 (MCH) config register
> 0xF4 to zero and effectively disabling the device again. The delay
> looks random to me. I can easily update the register using
> 'hexedit /sys/bus/pci/devices/0000\:00\:00.0/config' and see
> correct values in lspci output afterwards.

Could be the BIOS is using the device in SMI code or something (and 
that's what disables it), therefore it may be unsafe to unhide this device.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/